Continuous core making machine



M. W. ZEMAN May 23, 1933.

CONTINUOUS CORE MAKING MACHINE Filed July 30, 1931 mm W? W n m w m Patented May 23, 1933 UNIT,

MERTON W. ZEMAN, OF LAKEWOOD, OHIO, ASS IGNOR TO THE OSBORN' MAIQ'UFACTUBQING COMPANY, 01* CLEVELAND, OHIO, A CORPORATION OF OHIO f,

CONTINUOUS CORE Application filed July 30,

The present improvements relating, as .indicated, to mold and core making mechanism, have more particular regard to means for blowing sandinto a core box, mold, or the like. In machines of this type a chamber containing sand is brought over the core box and air under pressure then applied to the sand 1n such chamber to force the same into the box. There is,.however, a tendency for the air to channel, or funnel, through the sand, instead of applying pressure uniformly thereto, and one principal object of the present invention is to provide means for overcoming this tendency. Another object is to provide means for imparting a rotary action to the air as it is admitted to the air chamber over the same, thus further preventing funnelling. Still'another object is to prevent sand from being blown back throughthe ex haust valve and so cutting the same.

To the accomplishment or" the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in'the claims, the annexed drawing and the following description setting forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:

Fig. 1 is a vertical sectional view of a mold or core filling machine in which the present improvements have been incorporated; Fig. 2 is a vertical sectional detail view of one part of the mechanism, showing modification in construction; Fig. 2 is a transverse section taken in the plane indicated by the line aa, Fig. 2; and Figs. 3 and 4 are vertical sectional views similar to Fig. 2, but showing the other modified forms of construction.

The general construction of the core filling machine illustrated is more or less typical, consisting of a base 1, on which is mounted a vertically reciprocable table 2 adapted to support one or more core boxes 3. Associated with such table is a fixed abutment at and a movable abutment 5, by means of which such boxes may be clamped to the table. Movably supported above the table so as to be shift- MAKING BIACHINE 1931. Serial No. 554,063.

able into and out of alignment with the core boxes 3,'when supported onthe -latter,wis a sand chamber 6. The latter is shown in such aligned position in Fig. 1, but in another position, i. e., when moved to'the rightfrom that shown in said figure, the sand chamber is aligned with a hopper 7, through which sand may be supplied to said chamber.

Qlocated above the path of travel. of said sand chamber in fixed alignment with the position occupied by the latter when aligned by the core box or boxesis an, air chamber 8. Such air chamber is provided with a gasket 9. adapted to make a close fitting contact with the upper end of the sand chamber when in aligned position and said air chamber is also provided in its upper portion with a port 10 for admitting airunder pressure, such air being supplied through a conduit 11 under control of a valve 12. Another valve 13 controls a port 14 whereby the air in chamber 8 may be exhausted when desired.

In the normal operation of the machine, the sand chamber 6 after receiving through hopper 7 a proper quantity of sand is shifted into the position shown in Fig. 1, the core box or boxes 3 are clamped to the table 2 and the latter elevated to press against a perforated plate 15 that forms the bottom of said sand chamber. At the same time the upper end of the latter is pressed against the gasket 9 to form a sealed connection with air chamber 8. Valve 13 being closed, valve 12 is opened to admit air under pressure into chamber 8 and the sand in chamber 6 is thereby forced through the openings in plate 15 into thecavities in the core boxes.

In order to prevent the tendency which such air otherwise has of channeling through the body of sand in chamber 6, I provide a baffle 16 directly below port 10 in air chamber 8, such battle being suitably supported as by rods 17 and preferably being in the form of a concave disk with concave side directed toward such port. As a result, the air which enters through the port "with considerable force strikes the battle and is thereby diverted outwardly and around such baflie, filling the air chamber as well as the sand chamber above the body of sand in the latter uniformly, with the result that the sand is compacted and forced downwardly as a mass. In other words, the tendency of the air to find a chan nel and flow in a stream through the body of sand is greatly minimized, if not entirely eliminated. further serves toprevent sand from being carried out with the air through port let, when exhaust valve 13 is opened, thus reducing the serious cutting action to WlllCllSELlCl valve is otherwise subjected.

In order to impart a rotary or swirling motion to the air as it enters chamber 8, the walls of the latter may be provided'with spiral, inwardly projecting ribs 8a, as clearly shown in F igi 1-. of theairis' still further to reduce its tendency to channel or funnel through the sand.

In Fig. 2 there is shown a modified form of-b'afiie" 18 which diflers from the baffle 16 in'thatit is provided with a peripheral clownwardly incliningflange 19. The function of this flange is-to assist further in deflecting downwardly any particles of sand that may bethrown upwardly by the force of the air entering'thesand chamber 6 and striking the body of sand' therein, as well as to prevent sand being carried out through exhaust port 14' when exhaust valve 13 is opened, as previously described; In order to assist in givingthe air desired-swirling or rotary motion, this-flange 19 is preferably formed-with spiral corrugations 19a, as illustrated in Fig. 2a.

It will be understood that such corrugated flange may be employed either alone, as shownin saidFig. 2a,. or inconj unction with spiral ribs Set for the purpose last stated.

The baffle may also take on other forms. Thus, in Fig. 3 there is'shown a simple, fiat disc-like plate 20 and in this connection further modification is'also shown in that the inner wall of air chamber 8 is shown as of tapering-or conical form, such wall diverging outwardly from the upper end where the air enters to the lower end designed to contact with the upper end of. sand chamber 6.

In;- Fig. 4 there is shown a concave disc, similar to disc 16, but with the concave side thereof directed downwardly, i. e., away from the port. Also in this figure a further modification inthe inner wall of air chamber 8 is shown in that such wall converges inwardly toward its lower end which is designed to gontact with the upper end of sand cham- 7 It will be understood that the various modified forms of construction illustrated in the several figures thus described may be vari ously combined, all Within the spirit of the invention. Thus the wall of chamber 8 as shown in Fig- 1 with or without the spiral ribs 80 may be of tapering form, converging eithe'r'upwardly'or downwardly as illustrated in Figs. 3 and 4E respectively.

Other modes of applying the principle of- The interposition of-such battle The effect of such rotary action my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be with the open end of said sand-chamber and provided with a port-for admitting'air under pressure, a baffle located in'said air chamber in the path of air entering through such port, said bafile being in the form of a concave disc with concave imperforate side directed to-. wards such port, and having its edge spaced from the walls-of said air-chamber. I v

3; In mold and core filling mechanism, having an open-ended sand-chamber, an airchamber adapted to have ti ght-fitting engage ment with the open end of said sand-chamber and provided with a port for admitting air under pressure, a baflle located in the path of air entering through such port, said baffle being in the form of an imperforate concave disk with concave side directed towards such port and further having a reversely inclining flange, the edge of said flange and the wall of said air-chamber defining an annular passage to said sand chamber out of the line from said port to said chamber.

4:. In mold and core filling mechanism having a sand-chamber, an air-chamber adapted to have tight-fitting engagement with the upper end of said sand-chamber and provided with a. port for admitting air under pressure,

said sand and air-chambers being relatively movable transversely of each other, means for.

supplying sand to said sand chamber when out of alignment with said air-chamber, means for supporting a core box in sand receiving position below said sand-chamber, means for reversing the flow of. air in its course from said air port to said sand-chamber. I

5. In mold and core filling mechanism hav ing asand-chamber, an air-chamber adapted to have tight-fitting engagement with the upl per end of said sand-chamber and provided with a port for admitting air under pressure, said sand and air-chambers being relatively movable transversely of each other, means for supplying sand to said sand-chamber whenv out of alignment with said air-chamber, means for supporting a core box in sand receiving position below said sand-chamber, means in said air-chamber located below such port, for directing air from said air port to said sand chamber in a tortuous course.

6. In mold and core filling mechanism of the type having a sand-chamber, an airchamber adapted to have tight-fitting engagement with the upper end of said sandchamber and provided with a port for admitting air under pressure, said sand and airchambers being relatively movable transversely of each other, means for supplying sand to said sand-chamber when out of alignment with said air-chamber, means for supporting a core box in sand receiving position below said sand-chamber, a battle in said air-chamber located below such port, said bafile being in the form of an imperforate member masking said port but spaced axially therefrom and spaced at its edge inwardly from the wall of said air-chamber.

7 In mold and core filling mechanism, the combination of an open-ended sand-chamber, an air-chamber adapted to have tight-fitting enga ement with the open end of said sandcham er and provided with a port for admitting air under pressure, and means adapted to impart a swirling action to air entering through such port.

8. In mold and core filling mechanism, the

combination of an open-ended sand-chamber,

an air-chamber adapted to have tight-fitting engagement with the open end of said sandchamber and provided with a port for admitting air under pressure, and spiral ribs in the side-wall of said air chamber adapted to impart a swirling action to air entering through said port.

9. In mold and core filling mechanism of the type including an open-ended sand-chamber, an air-chamber adapted to have tight-fitting engagement with the open end of said sand-chamber and provided with a port for admitting air under pressure, a bafiie located in the path of air entering through such port, said baflie being in the form of a concave disk with concave side directed towards such port and further having a reversely inclining entering through such port and spiral ribs on the side-wall of said chamber adapted to assist in imparting such swirling suction to the air.

11. In mold and core filling mechanism having a sand-chamber, an air-chamber adapted to have tight-fitting engagement with the upper end of said sand-chamber and provided with a port for admitting air under pressure, said sand and air-chambers being relatively movable transversely of each other, means for supplying sand to said sand-chamber when out of alignment with said airchamber, means for supporting a core box in said receiving position below said sand-chamber, means for admitting air around the edge of the upper end of the sand-chamber out of direct line from said air port.

12. In mold and core filling mechanism having a sand-chamber, an air-chamber adapted to have tight-fitting engagement with the upper end of said sand-chamber and provided with a port for admitting air under pressure, said sand and air-chambers being relatively movable transversely of each other, means for supplying sand to said sand-chamber when out of alignment with said airchamber, means for supporting a core box in sand receiving position below said sandchamber, means for admitting air around the edge of the upper end of the sand-chamber out of direct line from said air port, and {)neans for agitating the air in the sand-cham- Signed by me, this 20th day of Jul 1931.

MERTON W. ZE N.

flange formed with corrugations adapted to V impart a swirling action to air entering through such port.

10. In mold and core filling mechanism, the combination of an open-ended sand-chamber, an air-chamber adapted to have tight-fitting engagement with the open end of said sandchamber and provided with a port for admitting air under pressure, and a bafile located in the path of air entering through such port, said baffle being in the form of a concave disk with concave side directed towards such port and further having a reversely inclining flange formed with corrugations adapted to impart a swirling action to air 

